<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    div{
      overflow: hidden;
      float: left;
      width: 200px;
      height: 200px;
      margin: 10px;
    }
    img{
      background: no-repeat;
      width: 100%;
      height: 100%;
    }
    div img{
      transition: all 0.6s;
    }
    div img:hover{
      transform: scale(1.1);
    }
  </style>
</head>
<body>
<div><a href="#"><img src="../img/back.jpg" alt=""></a></div>
<div><a href="#"><img src="../img/back.jpg" alt=""></a></div>
<div><a href="#"><img src="../img/back.jpg" alt=""></a></div>
</body>
</html>
